Backpack sprayer



FIG. 1 is a back perspective view of a backpack sprayer showing my new design;

FIG. 2 is a top view of the backpack sprayer of FIG. 1;

FIG. 3 is a back view of the backpack sprayer of FIG. 1;

FIG. 4 is a left side view of the backpack sprayer of FIG. 1;

FIG. 5 is a front view of the backpack sprayer of FIG. 1;

FIG. 6 is a right side view of the backpack sprayer of FIG. 1; and,

FIG. 7 is a bottom view of the backpack sprayer of FIG. 1. 

CLAIM The ornamental design for a backpack sprayer, as shown and described. 